You will need a Phillips screwdriver.
1. Disconnect the wire from the terminal «minus» battery.
2. Remove the right overlay of a frame of a windscreen (see «Removal and installation of overlays of a frame of a windscreen»).
3. Disconnect the block with wires from the resistor terminals.
4. Turn out the screw of fastening..
5.... and remove the additional heater resistor. For clarity, the work is shown on the removed heater.
6. Install the resistor in the reverse order of removal.